Elbridge wheeler



(No Model.) H

E. WHEELER. MOLD OR APPARATUS FOR CASTING COMPOUND INGOTS- g 1 UNITEDSTATES :nnnmnen \vnnntnn, or nos'rolv, MASSACHUSETTS, ASSlGN-OR 'roHIMSELF,

PATENT O FICE.

\VAHE ll. HA Y, ANl) (lllOltfill \V. GOGI'N, flli-US'IEIIS, ALL OF SAMEPLACE.

MOLD OR APPARATUS FOR CASTING COM-POUND INGOTS.

SPECIFICATION forming part of Letters Patent No. 363,032,6g1ted May 17,1887. Application filed Aprll4,1894. Serial No.1:2fi,669. (No model.)

To aZZ whom it may concern.-

Be it known that I, ELBRIDGE WHEELER,

of Boston, county of Suffolk, State of 'Massa:

chusetts, have invented an Improvement in Molds or Apparatus for CastingOne Metal Around Another, of which the following description, inconnection with the accompanying drawings, is a specification, likeletters on the drawings representing like parts.

My invention has for its object to cast in a compound mold two distinctgrades of metal for the production of an ingot which shall be composedat one part of a hard and at another part of softer metal, preferablysteel the hard steel being either outside or inside, according to theuse to be made of the ingot. To accomplish this desired result, I havedevised a compound mold, or a mold within a mold, the inner mold takingup in the outer mold substantially the space which will ultimately betaken n p in the ingot by the secondof the two metals to be poured toform the said ingot.

In my invention for producing a compound ingot from different metals,the first metal to be poured is poured into the inner m old,while thelatter is contained in the outer mold, and thesecond metal to be-poured'is poured into the space left in the outer mold by withdrawing from. itthe inner mold after the first cast or casting has been made.

When casting a metal about a core, and then drawing the core andthereafter filling up the metal first cast, which has been done, theouter side of the metal first east is chilled by its contact with themold, and the inner surface of the said metal is chilledto such anextent while the core is being drawn as to prevent fusion between themetal of the first cast and the metal thereafter poured into it.

In accordance with my inventionthe first or center cast is cooled by themold only upon its outer surface, leaving the main central body of thefirst cast unexposed and in a fluid condition, so that the internal heatof the said first cast, the mold being drawn quickly and the secondmetal being quickly poured-into the space left vacant by drawing theinner mold, is sufficient with the heat of the surrounding metal toenable the outer surface of ,the first my invention; Fig. 2, a like toeffect a fusion at its surface with the surrounding metal of' the secondcast, thus making a homogeneous ingot composed of two distinct grades ofmetal or steel.

and outer mold constructed in view thereof with the inner mold filledwith metal for the first cast and the inner mold thereafter partiallypulled; Fig. 3, a like view with the second cast poured on the firstcast and the outer mold unbooked and separated, Fig. 4 is a top view ofFig. 1. Fig. 5 is atop view of Fig. 3. Fig. 6 is a'view of- Fig.2 in theline a: ab, showing thesand-supports aspartially drawn out, and- Fig." 7shows the ingot removed from the molds. In Figs. 4 to 6, inclusive,thedotted line as :0 represents theline of section for Figs.

1 to'3, inclusive.

. The compound mold is composed of an outer mold, A, and an innermold,B, set on a base, 0, the said inner and outer molds, as hereinrepresented, being composed of two halves.v

The halves or parts of the outer shown as book'sa,- but instead thereofI may employ any other usual mold-fastening devices, such as clamps.the'edges of its halves meet (see Figs. 1 and 4) is grooved, as at h, toreceive'dry' sand to form a fluid-metal-tight joint. The-base C-is shownas recessed or chambered at c, and the said recesses or chambers areclosed by means of covers 0 or slides arranged, as shown, opposite thespaces between the inner and outer molds, to support sand, (I, or othernonvfusible substance which will keepthe said moldsfrom v mold are]01D6d together by means of fastening devices,

.The inner mold where accordance with" direct contact, but yet permitthe in uer mold to be drawn from the outer mold without sticking.

With the parts :s in Fig. .l, the metal for the first cast will bepoured so as to fill that part of the compound mold which is not filledby the inner mold, and to do this the metal first poured meets the base0 at the lower end of the inner mold, and the said metal for the firstcast thus fills the inner mold, as at f, Fig. 2, where the first cast ismarked f. Immediately upon the production of the first cast, and whilethe same is yet hot, the slides or covers 0" are fully drawn out, asrepresented by but one of the said slides in Fig. 6, thus enabling thecolumn of sand or equivalent material to drop into the recesses orchambers 12, (see Figs. 2 and 6,) thus leaving spaces 9, so that theinner mold may be easily lifted or pulled from the outer mold without.friction one against the other. v

Fig. 2 shows the inner mold partially pulled to leave the first east, f,standing on the plate C, and as soon as the mold B is pulled and beforethe surface of the same has a chance to oxidize or cool, provided afusion of the surfaces of the metal of the first cast is desired withthe metal of 'the second cast, the metal 'for the second east, 8, orshell is poured into the withdrawing the inner mold, B, from it.

- and separated, as in space left in the outer mold, A, by pulling orThe second cast, 8, having been made outside the first .cast, f, themold A will be unfastencd Figs. 3 and 5, to enable the ingot to bewithdrawn; or the outer mold may be entirely removed from the bottomportion, 0, leaving the ingot as in Fig. 7, wherein the first cast ismarked f, and the second or external cast 8.

In practice the kind of metal first to be poured is determined by thecharacter of the ingot desired to be produced. If an ingot with a hardsurface and a softer metal center i desired, the first or inner cast isof soft steel or metal and the second or outer cast of a harder steel ormetal; but if an ingot with a hard steel or metal center and a softersurface is desired, then the first or inner cast is made of the hardsteel or metal and the second or outer cast of a softer metal.

The ingot first described may be used advantageously for a variety ofpurposes, among which I will name a railroad-rail.

A rail made from an ingot having a harder surface forms the subject ofanother applica tion, No. 126,656, filed April 4, 1884, and is thereforenot herein claimed.

The molds A B will. be composed of metal.

An ingot with a hard center and softer surface is useful for variouspurposes, among which I will mention armor-plates.

I elaiml 1. A compound mold for casting compound ingots, composed of anouter mold and a sec: ond removable hollow mold arranged within theouter mold, in order that the first c. t may be made in the inner mold,that the inn r mold may be then withdrawn, and that the last cast may bemade in the space at first occupied by the inner mold, as and for thepurpose set forth.

2. The outer mold combined with the inner mold, separated therefrom by afilling ofsand or non-fusible material, to enable the inner mold to bereadily drawn from the outer mold, substantially asdescribed.

3. The outer and the inner molds separated by a film or layer of sand ornon-fusible material, combined with the base-plate provided withrecesses or chambers for the reception of the said sand when the innermold is to be drawn from the outer mold, substantially as described. I

4. The hollow laterally separable outer mold, combined with the hollowremovable inner mold, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

nnnnmcn WHEELER.

Witnesses:

G. W. GREGORY, B. J. NoYEs.

